PIX 2015
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Studio Tests (Full frame)

Again the Tamron 24-70mm F2.8 VC does extremely well in our tests on full frame, and while it's not quite as good as its Canon counterpart wide open at the long end, the results are very similar once stopped down to F4. The barrel distortion at 24mm is pretty strong though, and would probably need correcting when shooting geometric subjects such as architecture.

Sharpness At F2.8, central sharpness is high at all focal lengths, but the edges are somewhat softer, especially towards the tele end. Stop down to F4, though, and cross-frame sharpness is impressive through the whole range. As we'd expect optimal results are achieved around F5.6 - F11, beyond which diffraction starts to blur the image.
Chromatic Aberration Lateral chromatic aberration is on the whole very low. You will see a little fringing towards the edges and corners if you go looking for it, but it will rarely have much practical impact.
Vignetting Vignetting is, as usual, much stronger on full frame compared to APS-C. It's very pronounced at wideangle, with a 2 stop drop in brightness in the extreme corners at 24mm and F2.8; this drops progressively on stopping down but never quite goes away. At the telephoto end, there's a precipitous drop in brightness towards the extreme corners of the frame at F2.8, which is likely to be very visible in shots with even-toned backgrounds. However this disappears on stopping down to F4.
Distortion Distortion becomes more pronounced on full frame compared to APS-C. There's rather strong barrel distortion at wideangle (2.5%), changing to visible pincushion distortion at telephoto (-1.7%). This is strong enough that it's likely to need correcting in certain applications such as architectural photography.

Macro Focus

Macro - 165 x 110 mm coverage
Measured magnification: 0.20x
Distortion: Slight barrel

Minimum focus distance*: 34.8 cm
Working distance**: 16.2 cm
Focal length: 70mm
* Minimum focus is defined as the distance from the camera's sensor to the subject
** Working distance is measured from the front of the lens to the subject

As you'd expect, at minimum focus the story is much the same as we saw on APS-C. The image is distinctly soft at F2.8, but the centre sharpens up well on closing down a stop to F4. The corners are noticeably softer in our flat-field chart test, but sharpen up well on stopping down. Most of the frame is sharp at F11, the with the best overall results at F16. There's visible barrel distortion, and moderate blue/yellow colour fringing in the corners from lateral chromatic aberration.

Image Stabilization

The Tamron 24-70mm F2.8 VC's standout features is, of course, its built-in 'Vibration Reduction' optical image stabilization system - a feature that neither Canon nor Nikon have managed to include in their counterparts. The mechanism is effectively silent when operational, with only the uncanny stabilization of the viewfinder image betraying the fact that it's running. Unusually, Tamron doesn't make any specific claims about how effective the system might be.

To determine the effectiveness of the VC system we subjected the 24-70mm to our studio image stabilization test, using both the wideangle and telephoto settings. The subject distance for these tests was approximately 2.5m, and the test camera was the Canon EOS 6D using its 'Silent' shutter mode.

We take 10 shots at each shutter speed and visually rate them for sharpness. Shots considered 'sharp' have no visible blur at the pixel level, and are therefore suitable for viewing or printing at the largest sizes, whereas files with 'mild blur' are only slightly soft, and perfectly usable for all but the most critical applications.

24mm VC OFF 70mm VC OFF
24mm VC ON 70mm VC ON

The 24-70mm, like previous Tamron lenses we've reviewed, performs very impressively in these tests. At 24mm we get almost as good results at 1/2 sec with VC turned on as we do at 1/30 sec with it off - an advantage of about four stops. Even using a shutter speed of 1 sec we get some perfectly sharp shots handheld. Granted that these tests are indoors under ideal conditions, rather than outside in the wind or cold, but even so this is very impressive stuff.

At 70mm the story is much the same: we get essentially as good results at 1/5 sec with VC on as at 1/80 sec with it off, again a clear 4 stop advantage. Things fall apart completely at 0.4sec, but it seems churlish to complain. One slightly unexpected complication is the proportion of not-quite-sharp shots at 1/80 sec and 1/40sec, suggesting the VC unit can't quite compensate fully for the initial impulse of the shutter release. But remember we're looking closely at 20MP images here - for many practical purposes such slightly-blurred shots will be entirely usable.

Real world examples

Our studio tests are designed to give an indication of how effective image stabilization systems can be under ideal conditions. In the real world you may not get quite the same degree of stabilization, especially when shooting under inclement conditions or pointing the camera at awkward angles. As usual you'll normally get best results if you make a habit of waiting a second or so for the system to settle before releasing the shutter.

The examples below should give you an idea of how well the Tamron's VC system behaves in everyday shooting; in both cases the image would be hopelessly blurred without stabilization. They illustrate that VC isn't just useful for taking pictures in lower light.

In the first example we've taken advantage of the ability to shoot hand-held at a slow shutter speed to set the camera to ISO 100 and the lens to F5.6 for optimum results. The shutter speed is 1/15 sec at 70mm on APS-C (112mm equivalent), or three stops slower than we might usually expect to be able to hand-hold, and the the results are perfectly acceptable even when viewing the image at 100%. In the second example we've taken advantage of IS to stop down to F5.6 for depth of field, while still keeping the ISO low.

70mm, Canon EOS 650D
24mm, Canon EOS 650D
1/15 sec, F5.6, ISO 100 1/8 sec, F5.6, ISO 200
100% crop 100% crop
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Comments

Total comments: 16
jeejay98

This is a great lens. I highly recommend it. Just don't buy it from DigitalRev. You would get charged tax and if they used DHL as shipper, there is a so called "payment deferment" charge for being a broker for Customs and Border Patrol.

0 upvotes
handsomeguy

Just got it two days back and am totally zapped by its results. Tack sharp at all aperture settings and zoom range..the much-criticized vignetting and CA at 24mm 2.8 are not too obvious at least to me (I am not a pixel-peeper and don't want to be one). Luckily, I got the good copy...I will surely give five stars to this lens!

0 upvotes
Neogene

Used during my 15days Japan Tour, after three days of rain the lens got steam inside it, i had to wait until it got dry.

It's a mess isn't weather sealed.

I noticed a bit of color aberrations during my cloudy shots.

1 upvote
jkmnop

...still going:

When we talk about lens contrast, we are not talking about that quality. What we're talking about is the ability of the lens to differentiate between smaller and smaller details of more and more nearly similar tonal value. This is also referred to as “microcontrast.” The better contrast a lens has (and this has nothing to do with the light/­dark range or distribution of tones in the final print or slide) means its ability to take two small areas of slightly different luminance and distinguish the boundary of one from the other.

https://luminous-landscape.com/understanding-lens-contrast/

OK. Done.

0 upvotes
jkmnop

...still going:

*microcontrast/lens contrast - here's an interesting piece (predating the digital era) about what this means and what you're looking for/at when you're digging deeply into the quality of a lens. Here's the essence of the piece (by my lights):

Many photographers and even some experienced and knowledgeable ones, seem permanently confused about contrast, especially when the word is used to describe lenses. In photography, like the word “speed” (which can refer to the maximum aperture of a lens, the size of the gap in a constant-rate shutter, or the sensitivity of an emulsion), the word “contrast” actually refers to several different things. “Contrast” in photo paper, for instance, or in a finished image, refers to overall (sometimes called “global“) contrast, meaning how the materials distribute tonal gradation from black to white or lightest to darkest.

0 upvotes
jkmnop

...continued from previous post:

At 100mm - I compared the Tamron at 70mm and forgot to try the 70-200mm here - and here again the 24-105 was better on both counts. And, if you want to have your socks blown off for reasonable bucks, check out this 100mm: stunningly beautiful sharpness and contrast.

0 upvotes
jkmnop

So I went back and tested the Tamron SP 24-70mm F/2.8 Di VC USD vs all of the lenses I have:

Canon EF17-40mm F/4L USM
Canon EF50mm F/1.8 II
Canon EF24-105mm F/4L IS USM
Canon EF100mm F/2.8 Macro USM
Canon EF70-200mm F/4L IS USM II

Except in the case of the 100mm I matched focal lengths and shot everything at F4, the same image, from a tripod.

The 50mm lens, a cheapie but goodie, trailed the pack. Not worth discussing.

At 24mm the Tamron showed slightly less sharpness than the 17-40 and markedly less sharpness than the 24-105. Microcontrast/lens contrast* was noticeably poorer than both the Canon lenses resulting in flatter depth and flatter tonality.

At 50mm the Tamron showed slightly better sharpness than the 24-105 but again the microcontrast/lens contrast* was poorer resulting in poorer perceived sharpness away from the point of focus as well as flatter tonality.

At 70mm the 24-105 was sharper and showed better contrast. The 70-200 smoked them both...continued.

0 upvotes
jkmnop

Just bought one yesterday and will return it. I was hoping to replace my Canon EF2-105mm f.4L IS USM with it. I tested the Tamron against my existing lens as well as my Canon EF70-200mm f/4L IS2USM at the 70 mm focal length.

While the Tamron is good there is, on close inspection, a very noticeable difference in the differentiation of highlight and shadow between the Canon lenses and the Tamron. The Canon lenses do it much better. This improves perceived three dimensionality as well a giving a depth and richness of tone that the Tamron simply does not. The Tamron images appear flat and washed out compared to those with the Canon lenses. I'm all about that tone.

Sorry, Tamron. Keep swinging.

Comment edited 34 seconds after posting
0 upvotes
robogobo

I'd love to hear some real world anecdotes from someone who went from the Canon 24-70 v1 to the Tamron, instead of going with the Canon 24-70 v2. Any regrets? It's the Zoom ring location and backwards direction that are making me hesitate. I've been shooting with the Canon for 12 years and can't imagine relearning that reflex.

Also, I've heard a few stories about AF problems with the Tamron.

Never used a Tamron lens before. Always thought they were junk. I have used a few Sigmas and had mixed feelings, though their Art line is stellar.

0 upvotes
Average User

Will Tamron make this lens for Sony FE mount? If so, could it have image stabilization?

0 upvotes
Jimothy H

Hello Admin,

Why is it the quality decrease when step down from 2.8 to 4 at the 70mm end? It's for a crop sensor test. The test with full frame doesn't have the same problem.

0 upvotes
jungfrow

Hi,
Just bought the Tamron SP 24-70 Di VC USD for nikon.
I noticed that there is a plastic rubbing sound when it focuses and when moving around the elements inside the lens seem to bump around a bit.
Is that normal?

0 upvotes
Chamu

Just bought this recently and absolutely love this lens. The lens is sharp and very quick. It's a very good alternative to similar Nikkor lenses.

0 upvotes
Nader Erfani

Indeed a very good lens which thanks to its stabilisation offers a lot more towards creative photography than one would at first anticipate.

0 upvotes
ecube

This Tamron SP 24-70 f/2.8 seem a cheaper and better alternative to Nikkor 24-70mm f/2.8. I'll stop by a local dealer to try it on my D800

1 upvote
camerosity

Just got this lens today. It's amazing. Heavy! But sharp at f2.8 and beyond with my D800.

0 upvotes
Total comments: 16